Doctor Who's Matt Smith says that River Song shouldn't be a regular companion.

Doctor Who star Matt Smith has expressed his belief that River Song (Alex Kingston) should never be one of The Doctor's full-time companions.

Smith explained that part of River Song's allure is that she suddenly appears when The Doctor needs her most.

"I think River's too independent to ever be a full-time companion; I think that's what makes River great as a character. The companions and The Doctor are doing their thing, then whoosh - in comes the hair," Bang Showbiz quotes Smith as saying.

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"It just messes The Doctor up and makes him go, 'Oh Christ, River's here', and it frightens him. And weirdly he's going, 'Why the hell am I attracted to her? What's that?' That's the woman who makes him go whoa."

River Song first appeared in Doctor Who in the Tenth Doctor two-parter 'Silence in the Library'/'Forest of the Dead' and has since returned for several adventures with Smith's incarnation of the Time Lord.

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